IRSN groups together more than 1,700 experts and researchers. IRSN carries out research and analysis in the fields of nuclear safety, protection against ionising rays, control and protection of nuclear materials and protection against acts of malevolence. IRSN plays an active role in providing information to the public within its fields of expertise: nuclear and radiological risks. IRSN is the technical safety organisation (TSO) of the French nuclear safety authority (ASN). IRSN is a co-founder of the European TSO Network (ETSON).
IRSN leads WP2 "Status of code validation on separate effect tests (SET) and combined effect tests (CET)". IRSN also participates in WP3 (TH system code calculations SACO) and WP4 (CWC) where it contributes to task 4.1 (test matrix specification) and task 4.4 (analysis of tests). In WP5, IRSN manages licensing aspects of the proposed passive safety systems.